Notizen: Vacancy Ordering in Anion-deficient LaNiO3
Abstract LaNiO 3 loses oxygen in well-defined equilibrium stages. Electron diffraction studies show the presence of super-structure due to vacancy ordering in an anion-deficient sample.
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Crystal structures and dehydrated divalent-copper-exchanged faujasite
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and dehydrated divalent-copper-exchanged faujasiteI. E. Maxwell and J. J. De BoerCite this: J. Phys. Chem. 1975, 79, 17, 1874–1879Publication Date (Print):August 1, 1975Publication History Published online1 May 2002Published inissue 1 August 1975https://do…
Lattice-resolution electron microscopy in structural studies of non-graphitizing carbons from polyvinylidene chloride (PVDC)
A lattice-imaging technique is applied in a study of the intimate structure of non-graphitizing PVDC C atoms heat treated in the range 803 K to 2973 K. Fine detail in the resulting electron micrographs indicates that the bulk material consists of a high proportion of intertwined crystallites comprising turbostraticall…
Estimation of mechanical properties for rigid polyurethane foams
Abstract Rigid plastic foams find application in construction mainly as core materials for loaded sandwich structures—in buildings, ground vehicles, and airplanes. This work provides an equation for the mechanical behavior of polyurethane foams as a function of foam density. Starting from a model conception and the qu…
Origin of secondary-electron-emission yield-curve parameters
From an analysis of the one-dimensional constant-loss theory of secondary electron emission, maximum yield (δm), primary electron energy at maximum yield (Eom), and both crossover energies EIoc and EIIoc are shown to depend on the surface and bulk properties of the emitting material through simple relations. In partic…
Superconductivity and electronic properties of layered compounds
The electrical, optical, and magnetic properties of layered compounds of dichalcogenides of transition metals and intercalated crystals are considered. Particular attention is paid to the anisotropy of these properties and to the analysis of the changes produced by intercalation. Experimental data are presented on the…
Model for Anomalous Self-Diffusion in Group-IVBTransition Metals
A model for anomalous diffusion in the bcc phase of group-$\mathrm{IV}B$ transition metals is proposed, based on the identity of structure of the activated complex for diffusion and the basal plane of the low-temperature metastable $\ensuremath{\omega}$ phase. An expression for the diffusion coefficient is derived fro…
Percolation Conductivity in W-Al2O3Granular Metal Films
The growth of W grains in sputtered W-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ films as a consequence of annealing results in a narrowing of the transition region from metallic to nonmetallic conductivity. The conductivity, $\ensuremath{\sigma}$, as a function of the volume fraction of the metal, $x$, exhibits a critical…
ChemInform Abstract: COMPLEXES OF LA(III), PR(III), ND(III), SM(III), GD(III), DY(III) AND Y(III) WITH 4‐AMINOANTIPYRINE
Abstract Die Titelkomplexe (I) wurden durch Reaktion des Liganden mit den Lanthanoidperchloraten dargestellt und durch Leitfähigkeits‐ und IR‐Untersuchungen ch siert.
Factors Affecting Design Stresses in Marine Propellers
The paper is concerned with the development of a satisfactory basis for assessing design stresses. An attempt is made to trace the prime factors involved and details are given of corrosion fatigue tests at various mean stresses on propeller alloys in the form of heavy castings. A new philosophy of design stressing has…
Electron spin resonance in V1-xCrxO2
Electron spin resonance has been studied in V 1-x Cr x O 2 compounds in the range fo compositions (0.3%<x<3%). The behaviour of the Cr 3+ resonance in the three insulating phases M 1 , T and M 2 has been examined. Strong modifications of this resonance occur at the M 1 -T phase transition, for which an interpretation…
Electrical conductivity and dielectric properties of NaCl, KCl, and KBr single crystals near their melting temperatures
The dielectric constant (K′) and loss (K″) of single crystals of NaCl, KCl, and KBr have been measured in the frequency region 104 to 107 Hz and in the temperature range 25 to 8 °C below their melting temperatures. The electrical conductivity of these crystals has also been measured at 104 Hz near their melting temper…
On the phase transformation of SnTe
Direct experimental evidence is presented concerning the transformation of SnTe. This transformation is proved to be cubic to orthorhombic. The transformation temperature is found to depend on the stoichiometry of this compound, in a way similar to that observed in the isomorphous GeTe, i.e. the transformation tempera…
Ionisation Energies and the Electronic Structures of the N‐oxides of Azanaphthalenes and azaanthracenes
Abstract The HeI photoelectron spectra of the N‐oxides of the azanaphthalenes 1 – 5 and of the azaanthracenes 6 , 7 were ascertained. The inferred ionisation energies, and the assignments of the spectra, are presented and are discussed in respect to the electronic structures of the N‐oxides and the spectra of the azad…
Theory of the effect of dynamic strain aging on mechanical properties
Dynamic strain aging (DSA) in solid solutions is described as diffusion of solute atoms to mobile dislocations, temporarily arrested at obstacles. As a consequence the solute concentration experienced locally by the dislocations depends on the time of arrest and the solute diffusion coefficient. Starting from this ide…
Species diversity among agnostoid trilobites
Most species of the suborder Agnostina are non-intergrading and best fit an allopatric model of speciation. Continued allopatry of some species is indicated by the existence of temporally correlative biofacies. Abrupt introduction of morphologically distinct agnostoid species into many areas suggests that migration of…
Analysis of Wavelength Derivative Spectra of Exciton in Cu2O
The line shapes of the exciton absorption spectra of Cu 2 O at various temperatures obtained by the wavelength modulation technique have been analysed on the basis of Toyozawa's theory. The n-th exciton lines for the yellow ( n ≥-2) and the green exciton series have asymmetric Lorentzian line shape and their half valu…
Magnetoplasma Oscillation of a Layered Electron Gas
The plasma dispersion of a layered electron gas in a magnetic field is calculated in the random phase approximation for the Voigt configuration. We found that the plasmon gradually changes its character from the two-dimensional to the three-dimensional ones as the spacing between the planes of the layer decreases.
Mössbauer Study of Ni0.99557Fe0.005S2–Magnetic Structure of NiS2–
Mössbauer experiment has been performed of 57 Fe doped in antiferromagnetic NiS 2 . The supertransferred hyperfine field of 19 kOe has been observed at 4.2 K. From the analysis of the supertransferred hyperfine field, it is concluded that NiS 2 has a non-collinear spin structure. The Ni spins with ordering of the firs…
Functional morphology and evolution of xiphosurids
Aspects of the morphology, evolution and systematics of the Xiphosurida are treated. The ancestral forms lacked specialization for ploughing, and their chilaria were evidently developed as prosomal walking legs. The corresponding tergite (of the pregenital segment) was probably separate from the main prosomal shield i…